Flexible conduit.



G. A. LUTZ.

FLEXIBLE GONDUIT.

LIOATION FILED JUNE'17,1907

Patented Mar. 30, 1909.

have invented certain new ,UN ED sTATEs; PATENT-OFFICE.

orlonen A, LUTZ. OFNEW roan, N. Y1, ASSIGNOR 'io AMERICANiCIRCULAR Loon-COMPANY,

' OF PORTLAND, MAINE, A CORPORATION MAINEz' FLEXIBLE coNDUI'r.

To all whom it may concern:

Be it known that I, GEORGE A. LUTZ, a citi-. zen of the United States, and resident of New York city, borough of Brooklyn,in the county of Kings and and useful Improvenients in Fexible Conduits, of which the following is a specification.

The object of my invention is to provide a flexible conduit for receiving electric con-- ductors, and in carrying out my invention I provide a plurality of parallel strips of suitable material, such as metal, extending longitudinally and arranged substantially in tubular form side by side, and within said strips I place a support or winding of suitable material, such as metal, and around the exterior of said strips I place a binding to hold the strips in place, which may be a wire Wound thereon, and to hold said binding in place I have shown depressions in the exterior surfaces of the longitudinal strips receiving said binding and preventing disstrip.

placement thereof.

In the construction shown in the drawings the interior supporting winding lies between interior projections of said longitudinal strips and lengthwise displacement of said strips is limited thereby. i

Reference is to be had to the accompanying drawings forming part hereof, wherein- Figure 1 is a side view of a conduit embodyin my invention, part being broken awa Y ig. 2 is a cross section substantially on t e line 2, 2, in Fig. 1, Fig. 3 is a longitudinal section on the .line 3, 3, in Fig. 2, and Fig. :15 is an edge view of a longitudinal The numeral 1 in the drawings indicates a series-of parallel longitudinally disposed strips placed edge to edgeand arranged subsaid strips being Within the tubularseries of strips is a support 2, which may be a suitable metal strip, and is shown wound in a spiral direction in tubular form so that the longitudinal strips 1 rest thereon and are supported thereby; To hold the strips 1 upon winding 2 I place a binding 8 binding may be of around strips 1, which The suitable wire wound in spiral fornn strips 1 are shown provided with inwardly extending projections 1 and external grooves 1*,wh1ch are shown made n spiral form at distances apart; and th windingsof State of New York,.

Specification of Letters Patent.

Application filed June 17, 1907'. Serial No. 379,347.

spiral-like form, placing tric conductors may readily Patented March 30, 1909.

strip 2 lie between the corresponding interior prtijections' 1 while the binder or wire 3 lies in the corresponding exterior depressions 1', whereby the longitudinal strips are supported and held securely in place. The projections l and-reentrant portions or depressions 1 in conjunction with the winding 2 and binding 3 limit longitudinal movement of strips 1. The grooved portions 1'" of strips 1 serve to assist said strips in bending when the conduit is to be carried around corners and otherwise, as the spiral grooves enable the strips to flex under bending strain.

The conduit may be made by producing strips 1 with the corresponding projecting and reentrant parts 1*, l arranged in spirallike form, winding the supporting strip 2 in the strips 1 thereon with the projections 1 extending between the edges of the convolutions of strip 2, and winding the binding 3 upon strips 1 and within the depressions or grooves 1 Elecbe drawn through the conduit formed as above described, owing to the relatively smooth inner surface of the conduit, and the latter is flexible, so as to readily the grooved portions of strips 1 serving to permit the strips 1 to readily bend.

Having now described my invention what I claim is:

l. A conduit comprising an-interior supporting member; parallel longitudinally disposed transversely curved strips laid wholly without said member and arranged substantially in tubular form, and bent in a spiral direction to increase the flexibility of the same, and a binder encircling said strips.

2. A conduit comprising an inner support. having adjacent edges spaced apart, longitudinally disposed strips laid wholly without said support and having inward projections located between the edges of said support, and a binder around said strips.

3. A conduit comprising a spirally wound strip, longitudinally. disposed strips laid holly without said spirally wound strip, and provided with inward projections and exterior grooves, and a binder surrounding said strips and laid in said grooves.

4; A conduit comprising a -spi-rally wound support, longitudinally disposed strips laid thereon and provided with s irally disposedinward projections-loco ted between the conbend when required,

vglutions of said support, and a binder sur- 7. In a conduit for electric Wires, a plurality of circumferentially curved strips, the edgesof each strip abutting with the edges 20 support, longitudir :lly disposed strips laid of adjacent strips, and each strip havin its thereon and provided with projecting and exterior surface provided with corrugations rentrant parts, the projecting parts extendtransverse to its longitudinal dimension, an ing between the 'convolutions of said supinner support combined with a binder en-v port, and a binder Wound in the reentrant circling said tube and holding said abutting 25 parts of said strips. edges in proper en agement.

6'. A conduit comprising a spirally wound Signed at New ork city, in the county of supporting strip, longitudinal strips laid New York and State of New York this 13th thereionprovided vlvith integ'ior spiralllly dis day of June A. D. 1907. pose projections ocated etween t e convolutions of said support and spirally dis- GEORGE LUTZ' posed grooves in theexterior surfaces of said Witnesses: strips, and a binder'wound in said grooves I T. F. BOURNE, over said strips. r i RALPH N. RAPHAEL.

rounding said strips.

5. A conduit comprising a spirally Wound 

